Need algebra & functions help

Mathematics
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The question is that... David bought the following items at the store: 1 gallon of milk $2.30 2 lbs of steak $7.45 1 package of potatoes $2.25 1 Ben & Jerry’s Ice cream $3.80. If he paid 5% sales tax, what was the total cost of his purchase?

Apr 28th, 2015

2.30 + 7.45 + 2.25 + 3.80 = $15.80

5% of 15.80 = (0.05)(15.80) = 0.79

15.80 + 0.79 = $16.59

Apr 28th, 2015

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